
32
TROUBLESHOOTING
PROBLEM
DISPLAYED
POSSIBLE CAUSE
SOLUTION
No indication, no
warning tone even
though system is
connected to mains
power supply
No input voltage
Check the building wiring and input
cable. Check if the input breaker is
closed
BYPASS LED light
up even though the
power supply is
available
Inverter not switched on
Press “ON/OFF” button to turn on UPS.
BATTERY LED lights
up, and audible
alarm sounding
every one beep in
every four seconds
Input voltage and/or
frequency are out of
tolerance
Check input power source. Check the
building wiring and input cable. Check if
the input breaker is closed.
Emergency supply
period shorter than
nominal value
Batteries not fully
charged / batteries
defect
Charge the batteries for at least 12 hours
and then check capacity.
Others